/usr/lib/pd/extra/jmmmp/ardourjack-gui-help.pd is in pd-jmmmp 0.1.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | #N canvas 436 287 450 300 10;
#X obj 165 118 ardourjack-gui;
#X text 92 42 controls your ardour settings from Pd;
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